1. 室外排(pai)水管(guan)道安裝要求
室外排(pai)(pai)水管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)起到(dao)排(pai)(pai)放(fang)污(wu)廢水與雨水的作(zuo)用(yong),污(wu)廢水在管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)中(zhong)依(yi)靠(kao)重力作(zuo)用(yong)由(you)高處(chu)流向低處(chu)。因此,排(pai)(pai)水管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)應(ying)有一定的下(xia)坡(po)度。為了(le)檢查(cha)(cha)及清通(tong)(tong)排(pai)(pai)水管(guan)(guan)(guan)(guan)(guan)道(dao)(dao),在管(guan)(guan)(guan)(guan)(guan)徑改變處(chu)或(huo)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)坡(po)度、支管(guan)(guan)(guan)(guan)(guan)接入處(chu)及管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)轉彎(wan)處(chu),都(dou)要設(she)廢水檢查(cha)(cha)井(jing)(jing),直(zhi)線(xian)段每隔一定距(ju)離也(ye)要設(she)污(wu)廢水檢查(cha)(cha)井(jing)(jing),檢查(cha)(cha)井(jing)(jing)通(tong)(tong)常用(yong)磚砌筑。室外排(pai)(pai)水管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)通(tong)(tong)常應(ying)與建筑物平行(xing)敷設(she),距(ju)建筑外墻(qiang)不應(ying)<2.5m。
2. 室外排(pai)水管(guan)道施工流程
室(shi)(shi)外排水管道一(yi)般直接(jie)埋在(zai)地下,其施工流程(cheng)是(shi):施工準備→測量放線→開挖溝槽→基(ji)底處理→下管→穩管接(jie)口(kou)→檢查與砌筑→水試驗→回填土。其中下管及其前面的項目,施工要(yao)求與室(shi)(shi)外給水管基(ji)本(ben)相(xiang)同。
3. 室外排水管道(dao)的管口與抹帶
室(shi)外排水管道的(de)管材,主(zhu)要(yao)有缸瓦管、混(hun)(hun)(hun)凝(ning)(ning)土管和(he)鋼筋混(hun)(hun)(hun)凝(ning)(ning)土管。混(hun)(hun)(hun)凝(ning)(ning)土管和(he)鋼筋混(hun)(hun)(hun)凝(ning)(ning)土管的(de)管口形(xing)狀,主(zhu)要(yao)有承(cheng)插口、平口和(he)企(qi)口三種,如圖2-50所(suo)示(shi)。其接口用水泥砂漿抹帶(dai)接口,常見的(de)抹帶(dai)形(xing)式(shi)有圓弧形(xing)和(he)梯形(xing)兩種,如圖2-51所(suo)示(shi)。
特別提醒(xing):室(shi)外排水(shui)管(guan)(guan)施(shi)(shi)工(gong)完畢(bi),要按(an)規(gui)定(ding)做閉水(shui)試驗。試驗時按(an)規(gui)定(ding)施(shi)(shi)加一定(ding)的壓力,觀(guan)察(cha)接(jie)口處(chu)及整個管(guan)(guan)道滲水(shui)情況,如(ru)有異常按(an)規(gui)定(ding)處(chu)理。